Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Common stock	Paid-in capital	Retained earnings	Accumulated other comprehensive loss
Beginning of period at Dec. 31, 2021		$ 156	$ 0	$ 12,913	$ (143)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchased		2		638
Net earnings	$ 1,901			1,901
Dividends declared				(516)
Stock compensation		1		(5)
Other comprehensive income (loss), net of tax	(16)				(16)
End of period at Jun. 30, 2022	$ 13,651	155	0	13,655	(159)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared per share	$ 3.30
Beginning of period at Mar. 31, 2022		156	0	13,277	(146)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchased		1		323
Net earnings	$ 946			946
Dividends declared				(270)
Stock compensation		0		25
Other comprehensive income (loss), net of tax	(13)				(13)
End of period at Jun. 30, 2022	$ 13,651	155	0	13,655	(159)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared per share	$ 1.73
Beginning of period at Dec. 31, 2022	$ 15,312	153	0	15,312	(153)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchased		2		930
Net earnings	1,654			1,654
Dividends declared				(549)
Stock compensation		0		(2)
Other comprehensive income (loss), net of tax	3				3
End of period at Jun. 30, 2023	$ 15,486	151	0	15,485	(150)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared per share	$ 3.60
Beginning of period at Mar. 31, 2023		152	0	15,135	(151)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchased		1		204
Net earnings	$ 812			812
Dividends declared				(284)
Stock compensation		0		26
Other comprehensive income (loss), net of tax	1				1
End of period at Jun. 30, 2023	$ 15,486	$ 151	$ 0	$ 15,485	$ (150)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared per share	$ 1.87